216401948338 has 4 divisors (see below), whose sum is σ = 324602922510. Its totient is φ = 108200974168.

The previous prime is 216401948333. The next prime is 216401948339. The reversal of 216401948338 is 833849104612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 214625578729 + 1776369609 = 463277^2 + 42147^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 216401948291 and 216401948300.

It is not an unprimeable number, because it can be changed into a prime (216401948333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54100487083 + ... + 54100487086.

Almost surely, 2^216401948338 is an apocalyptic number.

216401948338 is a deficient number, since it is larger than the sum of its proper divisors (108200974172).

216401948338 is a wasteful number, since it uses less digits than its factorization.

216401948338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108200974171.

The product of its (nonzero) digits is 995328, while the sum is 49.

The spelling of 216401948338 in words is "two hundred sixteen billion, four hundred one million, nine hundred forty-eight thousand, three hundred thirty-eight".